William t



(No Mgdel.)

v W. T. MoDONALD. SMOKE BURNING FURNACE FOR STEAM BOILERS.

1105344537. Patented June' 29, 188 6.

WITNESSES: v INVENTOR:

4 BY g ATTORNEYR N. PETERS. PhfllO-Lilhagnphnr, Wilhlnglen. D C

.UNITED PATE T OFFICE.

WILLIAM T. MCDONALD, OF NEW YORK, N. Y.

SMOKE-BURNING FURN ACE FOR STEAM-BOILERS.

SPECIFICATION forming part of Letters Patent No. 344,537, dated June 29, 1886.

Application filed December 22, 1885. Serial No. 186,463., (No model.)

To all whom it may concern:

I Be it known that I, WILLIAM T. McDon- ALD, of the city, county, and State of New York, have invented a new and useful Improvement in 'Smoke-Burning Furnaces for Steam-Boilers, of which the following is a full clear, and exact description.

Reference is to be had to the accompanying drawing, forming a part of this specification, and which is a sectional elevation of a furnace to which myvimprovement has been applied, the steam-boiler being shown in side elevation and with part broken away.

The object of this invention is to provide furnaces for steam-boilers constructed in such a manner that the gaseous and other combustible productsof combustion in the smoke will be consumed and the additional heat thus produced utilized for heating the boiler.

A represents afurnace, and B a stean1-boiler set therein.

Beneath the forward part of the boiler B is the fire-chamber C and the grate D, where fuel is burned in the ordinary manner, From the fire-chamber G the smoke and other gaseous products of combustion pass back beneath the boiler B, and return through the flues of the said boilerBto the flue E, through which they pass along the top of the said boiler B to the smoke-stack F.-

In the top of the furnace A, above the rear part of the boiler B, is formed a dome, G

within which is placed a T-shaped pipe, H

cross-arms. The lower end of the T-shaped pipe H- is connected with the horizontal pipe J which passes forward along the top of the boiler B, passes down at the forward end of the said boiler, and terminates in a nozzle, K, in the doorway or other suitable opening at the forward end of the furnace A, or in the forward part of the combustion-chamber 0.

With the rear end of the pipe J is connected the end of a pipe, L, which passes down at the rear end of the furnace A, passes forward through the lower part of the said furnace A,

and terminates in a funnel, M, in tire forward V part ofthe ash-pit N.

0 isa pipe, the outer endof which is connected witha cask or other reservoir of kerosene-oilplaced at a higher level than the nozzle K of the pipe J. The lower end of the pipe 0, directly below the nozzle K, is bent upward at right angles, and is provided with a nozzle, P, which is placed directly opposite and close to the said nozzle K.

Qis a pipe, the outer end of which is connected with the steam-space of the boiler B or some other steam-generator. The inner end' of the pipe Q is provided with a nozzle, B, is placed at right angles with, close to, and equaly distant from the two nozzles K I.

In the lower part of the chimney-flue F is placed a damper, S, so that the passage of the products of combustion through the said flue can be regulated or prevented, as may be required. With this construction, after the fire in the fire-chamber C is well started ,the damper S is closed or partly closed, which causes the gaseous and other light combustible parts of the products of combustion to rise into the dome G,where they are made to enter the funnels I, pass through the pipes H J, and pass out through the nozzle K by the tendency of the steam-jet from the nozzle R of the steampipe Q to forina vacuum in the said pipe J. This same tendency to form a vacuum in the pipe J causes air to pass into the said pipe J through the funnel M and pipe L, and become mixed with the gaseous products of combustion as they pass through the. said pipe J. The jet of steam from the pipe Q and nozzle R has also a tendency to produce a vacuum in the pipe 0, and causes a jet of kerosene-oil to be discharged from the pipe 0 and nozzle P, so that the gaseous products of combustion, mixed with air from the pipe J, kerosene-oil from the pipe 0, and steam from the pipe Q, will be discharged, in the form of a spray, into the fire-chamber 0 above the fire, and will be consumed, thus utilizing a large quantity of combustible matter that would otherwise pass off through the smoke-stack and be wasted.

It is quite evident that the unconsumed gases, together with the steam and petroleum, may be consumed beneath a separate boiler or for other purposes altogether, if desired.

The air-pipe L and gas-pipe J may beindependent, and the gases and air introduced separately into the furnace for combustion, if preferred.

Having thus fully described my invention,

I; I i i v v f Iclaimas new and desire to secure by Letters tachmentto a boiler-furnace, consisting in a I 5 j Patentsmoke-pipe extending from the smoke-flue to 1. In a smoke-burning furnace for steamthe combustion-chamber, and provided with a boilers, the combination, with the furnace A nozzle at its forward end, an air-pipe extend- 5 and the steam-boiler B, of the dome G, the T- ing from the rear portion of said smoke-pipe,

shaped pipe I-I, having funnels I, and the an oil-supply pipe provided with anozzlc, and 20 pipes J, O, Q, and L, the latter having funnel a steam pipe and nozzle, the nozzle end of M, and the nozzles K P R, substantially as said steam-pipe being arranged intermediately herein shown and described,whercby the gaseof and closely to the nozzle ends of the smoke IO ous products of combustion, mixed with air, and oil pipes, substantially as set forth;

kerosene-oil, and steam, will be introduced 'WM. '1. MCDONALD. into the fire-chamber in the form of a spray and Witnesses:

'- bnrned, as set forth. EDGAR TATE,

2. The herein-described smoke-burning at- EDWD. M. CLARK. 

